VOBMerge is a simple tool to make a DVD with a lot of .VOB files into a single .mpg file without converting the DVD (so you don’t have quality loss). Please note that VOBMerge doesn’t work with copyright-protected DVDs and it can’t convert DVDs to another format like mp4,avi,etc. Playing the files with Quicktime doesn’t work sometimes. This is not a bug, this is because Quicktime doesn’t support MPG files very well (there actually was an extension pack in the apple store for Quicktime Pro 7, but I haven’t seen it since Quicktime X came out). I recommend you using the free VLC Media Player.